Answer
Jun 16, 2025 - 07:09 AM
PRI stands for Primary Rate Interface, a telecommunications interface standard used on an Integrated Services Digital Network (ISDN) for carrying multiple voice and data transmissions between a network and a user. It operates over a T1 line in North America (with 23 bearer channels for voice/data and one signaling channel) or an E1 line in Europe (with 30 bearer channels and one signaling channel), allowing for simultaneous transmission of multiple calls and data streams. PRI is commonly used by businesses for connecting private branch exchanges (PBX) to the public switched telephone network (PSTN).
